diff --git a/docs/_javascript/preset_test.js b/docs/_javascript/preset_test.js
index c11c251a..a084dec3 100644
--- a/docs/_javascript/preset_test.js
+++ b/docs/_javascript/preset_test.js
@@ -16,7 +16,7 @@
   const SCHEDULER_EPOCH_MAX = 0xffffffff;
   const EARLY_JOIN_MS = 60 * 60 * 1000;
   const DEFAULT_START_HOUR = 17;
-  const DEFAULT_WINDOW_DAYS = 1;
+  const DEFAULT_WINDOW_DAYS = 2;
   const SCHEDULE_MODE_RELATIVE = "relative";
   const SCHEDULE_MODE_ABSOLUTE = "absolute";
   const CLOCK_RESET_COMMAND = "clkreboot";
diff --git a/docs/preset_test.md b/docs/preset_test.md
index 15cd690f..39348cab 100644
--- a/docs/preset_test.md
+++ b/docs/preset_test.md
@@ -9,7 +9,7 @@ create a shareable temporary-radio test URL.</span>
   <div data-role="content">
     <div data-role="test-content" hidden>
     <section class="preset-test-hero" aria-labelledby="preset-test-title">
-      <p class="preset-test-eyebrow" data-role="preset-test-eyebrow">MeshCore · one-day temporary preset test</p>
+      <p class="preset-test-eyebrow" data-role="preset-test-eyebrow">MeshCore · default 48-hour temporary preset test</p>
       <div class="preset-test-hero-row">
         <div>
           <h2 id="preset-test-title">
@@ -375,8 +375,8 @@ clock</code></pre>
         tuple. The generated URL converts the times to exact UTC instants, keeps
         the date punctuation readable, and keeps <code>tz</code> so the page
         displays them in the organizer's local time zone. With no URL settings,
-        the builder starts at 5:00 PM tomorrow and ends at 5:00 PM the following
-        day in the selected time zone.
+        the builder starts at 5:00 PM tomorrow and ends at 5:00 PM two days
+        later in the selected time zone, creating a 48-hour window.
           </p>
 
       <div class="preset-test-generator-layout">
diff --git a/mkdocs.yml b/mkdocs.yml
index d457f767..b478785a 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -30,4 +30,4 @@ extra_javascript:
   - _javascript/telemetry_decoder.js
   - _javascript/management_decoder.js
   - _javascript/filter_tool.js
-  - _javascript/preset_test.js?v=20260923-1
+  - _javascript/preset_test.js?v=20260923-2
diff --git a/test/test_preset_test.js b/test/test_preset_test.js
index 13948cf6..8365a27d 100644
--- a/test/test_preset_test.js
+++ b/test/test_preset_test.js
@@ -121,9 +121,9 @@ assert.strictEqual(
 );
 assert.strictEqual(
   defaults.endMs,
-  Date.parse("2026-09-24T17:00:00-07:00")
+  Date.parse("2026-09-25T17:00:00-07:00")
 );
-assert.strictEqual(defaults.endEpoch - defaults.startEpoch, 24 * 60 * 60);
+assert.strictEqual(defaults.endEpoch - defaults.startEpoch, 48 * 60 * 60);
 assert.strictEqual(defaults.freq, config.freq);
 assert.strictEqual(defaults.bw, 500);
 assert.strictEqual(defaults.sf, 8);
@@ -131,10 +131,10 @@ assert.strictEqual(defaults.cr, 7);
 assert.strictEqual(defaults.tx, 22);
 assert.strictEqual(defaults.tz, config.tz);
 assert.strictEqual(tool.isDefaultPreset(defaults), true);
-assert.strictEqual(tool.isDefaultPreset(config), false);
+assert.strictEqual(tool.isDefaultPreset(config), true);
 assert.strictEqual(tool.presetPageTitle(defaults), "Default temporary radio test · 910.1 MHz");
 assert.match(tool.presetPageSummary(defaults), /910\.1 MHz, 500 kHz, SF8, CR7, 22 dBm/);
-assert.strictEqual(tool.presetEyebrow(defaults), "MeshCore · default 24-hour temporary preset test");
+assert.strictEqual(tool.presetEyebrow(defaults), "MeshCore · default 48-hour temporary preset test");
 
 const dstDefault = tool.configFromSearch(
   "?tz=America%2FLos_Angeles",
@@ -147,9 +147,9 @@ assert.strictEqual(
 );
 assert.strictEqual(
   tool.zonedInputValue(dstDefault.endMs, dstDefault.tz),
-  "2026-03-08T17:00"
+  "2026-03-09T17:00"
 );
-assert.strictEqual(dstDefault.endMs - dstDefault.startMs, 23 * 60 * 60 * 1000);
+assert.strictEqual(dstDefault.endMs - dstDefault.startMs, 47 * 60 * 60 * 1000);
 assert.strictEqual(tool.isDefaultPreset(dstDefault), true);
 
 const requestedLink = tool.configFromSearch(